I just recently changed my neg battery cable when I did the battery.
The plastic ring is the current sensor that is factory installed and necessary for the alternator.
A new current sensor comes installed on the new neg cable.
Mine is a V-6 but the 4 cyl is very similar.
The neg cable splits 4 ways, a large diameter cable to the engine, a smaller one to the unibody frame rail, the current sensor, and a seprate ground for the BCM.
I got my cable from gmpartsdirect.com
The dealer has them, it is a bit involved, but all 4 connections are needed.
2014 Equinox LTZ FWD 3.6L. V-6 (LFX)
GM6T70 Transmission-Gen II(M7W)
Crystal Red Tintcoat-Brownstone Leather-(FE2) Suspension-18" Wheels
Build Date: Nov. 04, 2013-Delivery Date: Nov. 25, 2013
Last edited by rednox301; 01-18-2020 at 11:25 PM.